bench: Use environ to run compares more than once
This will run the benchmarks the number of times specified by NODE_BENCH_RUNS, to attempt to reduce variability. If the number of runs is high enough, it'll also throw out the top and bottom quartiles, since that's where the outliers will be. It's not very fancy statistics-fu, but it's better than nothing. Also, linted this file. It had tabs in it. TABS!
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@ -1,4 +1,6 @@
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var usage = 'node benchmark/compare.js <node-binary1> <node-binary2> [--html] [--red|-r] [--green|-g]';
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var usage = 'node benchmark/compare.js ' +
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'<node-binary1> <node-binary2> ' +
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'[--html] [--red|-r] [--green|-g]';
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var show = 'both';
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var nodes = [];
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@ -42,73 +44,85 @@ if (!html) {
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var runBench = process.env.NODE_BENCH || 'bench';
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if (nodes.length !== 2)
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return console.error('usage:\n %s', usage);
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return console.error('usage:\n %s', usage);
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var spawn = require('child_process').spawn;
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var results = {};
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var n = 2;
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var n = 1;
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run();
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var RUNS = +process.env.NODE_BENCH_RUNS || 1;
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var r = RUNS;
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function run() {
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if (n === 0)
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return compare();
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// Flip back and forth between the two binaries.
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if (n === 1) {
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n--;
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} else {
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r--;
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if (r === 0)
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return compare();
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else
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n++;
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}
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n--;
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if (n === -1)
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return compare();
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var node = nodes[n];
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var node = nodes[n];
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console.error('running %s', node);
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var env = {};
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var env = {};
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for (var i in process.env)
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env[i] = process.env[i];
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env.NODE = node;
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var child = spawn('make', [ runBench ], { env: env });
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var child = spawn('make', [runBench], { env: env });
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var out = '';
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child.stdout.setEncoding('utf8');
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child.stdout.on('data', function(c) {
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out += c;
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});
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var out = '';
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child.stdout.setEncoding('utf8');
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child.stdout.on('data', function(c) {
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out += c;
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});
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child.stderr.pipe(process.stderr);
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child.on('close', function(code) {
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if (code) {
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console.error('%s exited with code=%d', node, code);
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process.exit(code);
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} else {
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out.trim().split(/\r?\n/).forEach(function(line) {
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child.on('close', function(code) {
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if (code) {
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console.error('%s exited with code=%d', node, code);
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process.exit(code);
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} else {
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out.trim().split(/\r?\n/).forEach(function(line) {
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line = line.trim();
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if (!line)
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return;
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var s = line.split(':');
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var num = +s.pop();
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if (!num && num !== 0)
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return
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var s = line.split(':');
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var num = +s.pop();
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if (!num && num !== 0)
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return;
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line = s.join(':');
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var res = results[line] = results[line] || {};
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res[node] = num;
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});
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line = s.join(':');
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var res = results[line] = results[line] || {};
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res[node] = res[node] || [];
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res[node].push(num);
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});
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run();
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}
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});
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run();
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}
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});
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}
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function compare() {
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// each result is an object with {"foo.js arg=bar":12345,...}
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// compare each thing, and show which node did the best.
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// each result is an object with {"foo.js arg=bar":12345,...}
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// compare each thing, and show which node did the best.
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// node[0] is shown in green, node[1] shown in red.
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var maxLen = -Infinity;
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var util = require('util');
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console.log(start);
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Object.keys(results).map(function(bench) {
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Object.keys(results).map(function(bench) {
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var res = results[bench];
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var n0 = res[nodes[0]];
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var n1 = res[nodes[1]];
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var n0 = avg(res[nodes[0]]);
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var n1 = avg(res[nodes[1]]);
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var pct = ((n0 - n1) / n1 * 100).toFixed(2);
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@ -119,8 +133,8 @@ function compare() {
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if (show === 'green' && !g || show === 'red' && !r)
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return;
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var r0 = util.format('%s%s: %d%s', g, nodes[0], n0, reset);
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var r1 = util.format('%s%s: %d%s', r, nodes[1], n1, reset);
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var r0 = util.format('%s%s: %d%s', g, nodes[0], n0, g ? reset : '');
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var r1 = util.format('%s%s: %d%s', r, nodes[1], n1, r ? reset : '');
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var pct = c + pct + '%' + reset;
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var l = util.format('%s: %s %s', bench, r0, r1);
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maxLen = Math.max(l.length + pct.length, maxLen);
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@ -136,3 +150,14 @@ function compare() {
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});
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console.log(end);
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}
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function avg(list) {
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if (list.length >= 3) {
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list = list.sort();
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var q = Math.floor(list.length / 4) || 1;
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list = list.slice(q, -q);
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}
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return (list.reduce(function(a, b) {
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return a + b;
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}, 0) / list.length).toPrecision(5);
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}
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